Filofax Calculators

I'm not sure why, but I frequently find I need a calculator and I don't have my phone handy. 

Then I remembered 'I'm sure I have a Filofax calculator somewhere?' 

In deed I do and amazingly it didn't take me 3 hours to find it, it was with my other calculators... yes I have quite a few! 

It is solar powered, but having been sat in my desk in the dark for many months it took a boost to get it running again. I sat it in the sun for a few hours and it came back to life. As you can see all the segments on the display also work. 

Filofax made these calculators in a few sizes, I have a Pocket/Mini one as well. This Personal size one is labeled Personal, A5 and Deskfax size. 

I also found this simple credit card size solar powered calculator from Texas Instruments, it will slot in to a business card pocket in my organiser and therefore it won't take up valuable space on the rings. 

Again only simple functions, but the essential ones for those moments when you need to quickly total things on a list or similar. 

These credit card size calculators are readily available and they are very cheap (less than €3 each!)